As the youngest here... (I think) I always dress up. Dressy jeans in winter with a nice top. Summer would be a nice dress. It irks me on Christmas Day my family all make the effort and dress up, but hubbys family don't bother.
We like dressing up. Have tuxedo for when we go cruising. Off out tonight dancing. I will be wearing a shirt and tie and jacket as will most of the other men. Most of the ladies are also well dressed. It will be even better on both Christmas and New Years Eve. We are in casual clothes when we are in the house and not going out. I always wore a suit when I was working.